diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 55ced893..aa9c6d83 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -711,23 +711,7 @@ namespace WebSocketSharp.Server
       }
 
       set {
-        if (value <= TimeSpan.Zero)
-          throw new ArgumentException ("Zero or less.", "value");
-
-        string msg;
-        if (!canSet (out msg)) {
-          _log.Warn (msg);
-          return;
-        }
-
-        lock (_sync) {
-          if (!canSet (out msg)) {
-            _log.Warn (msg);
-            return;
-          }
-
-          _services.WaitTime = value;
-        }
+        _services.WaitTime = value;
       }
     }